Overclocking not Work - R9 280 Cards

Hello, everyone,
I hope you can help me, I use 3 cards and would like to clock them a little higher. Unfortunately, the entries have no function. Only the fan can be changed.
hive|690x217

Do you have an idea ?

I test it manually using the ohgodatool and get this wrong output:
root@***:/hive/sbin# ./ohgodatool -i 0 --show-core --show-voltage
Unable to read header from file.

maybe this is also the problem?
The cards’ bios are all original.

thanks in advance
ch

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